feat(web): add exporting flow functionality

packages/web/src/hooks/useExportFlow.js

@@ -0,0 +1,15 @@
+import { useMutation } from '@tanstack/react-query';
+
+import api from 'helpers/api';
+
+export default function useExportFlow(flowId) {
+  const mutation = useMutation({
+    mutationFn: async () => {
+      const { data } = await api.post(`/v1/flows/${flowId}/export`);
+
+      return data;
+    },
+  });
+
+  return mutation;
+}